a = '3 + 3.14'
print(a)
print(eval(a), type(eval(a)))

a = "3 + 3.14"
print(a)
print(eval(a), type(eval(a)))

a = "北京欢迎你"
print(a)
print(eval("a"), type(eval("a")))

height = eval(input("身高："))
print(height, type(height))